Although non-technical descents such as hiking down a canyon (canyon hiking) are often referred to as canyoneering, the terms canyoning and canyoneering are more often associated with technical descents — those that require abseils (rappels) and ropework, technical climbing or down-climbing, technical jumps, and/or technical swims.

Canyoning is frequently done in remote and rugged settings and often requires navigational, route-finding and other wilderness travel skills.

Canyons that are ideal for canyoning are often cut into the bedrock stone, forming narrow gorges with numerous drops, beautifully sculpted walls, and sometimes spectacular waterfalls. Most canyons are cut into limestone, sandstone, granite or basalt, though other rock types are found. Canyons can be very easy or extremely difficult, though emphasis in the sport is usually on aesthetics and fun rather than pure difficulty. A wide variety of canyoning routes are found throughout the world, and canyoning is enjoyed by people of all ages and skill levels.

Canyoning gear includes climbing hardware, static or semi-static ropes, helmets, wetsuits, and specially designed shoes, packs, and rope bags. While canyoneers have used and adapted climbing, hiking, and river running gear for years, more and more specialized gear is invented and manufactured as canyoning popularity increases.

Canyoning in the UK has gained in popularity over recent years. In the UK, Wales, Scotland, Cumbria and Yorkshire and some areas of Cornwall are recognized as the prime locations to try out this activity. In the Welsh language canyoning is called "cerdded ceunant". It has been described as slightly different from its American counterpart; however the activity involves all the traditional methods but in a different climate and location. Most experts who visit Wales for this activity often refer to it as "Gorge Walking", but the main concept remains the same.[1] The UK Scout Association defines "gorge walking" as "the activity of following a river bed through a gorge. This often includes climbing, swimming, abseiling and scrambling depending upon the environment".[2]

Canyoning in Ticino, Switzerland also named the eldorado for canyoning is one of a kind because of its authentic granite rock, crystal green pools and its pleasant mediterranean climate. This region has been popular throughout the whole story of canyoning, back in the days of the pioneers, but only the last few years is gaining an enormous popularity amongst more experienced canyoneers.

In the United States, descending mountain canyons with flowing water is sometimes referred to as canyoning, although the term "canyoneering" is more common. Most canyoneering in the United States occurs in the many slot canyons carved in the sandstone found throughout the Colorado Plateau.[3] Outside of the Colorado Plateau, numerous canyoneering opportunities are found in the San Gabriel, Sierra Nevada, Cascade, and Rocky Mountain ranges.[4]

Canyoning can be dangerous. Escape via the sides of a canyon is often impossible, and completion of the descent is the only possibility. Due to the remoteness and inaccessibility of many canyons, rescue can be impossible for several hours or several days.

Canyons with significant water flow may be treacherous and require special ropework techniques for safe travel. Hydraulics, undercurrents, and sieves (or strainers) occur in flowing canyons and can trap or pin and drown a canyoneer. A 1993 accident in Zion National Park, Utah, USA, in which two leaders of a youth group drowned in powerful canyon hydraulics (and the lawsuit which followed) brought notoriety to the sport.[7]

A potential danger of many canyoning trips is a flash flood. A canyon "flashes" when a large amount of precipitation falls in the drainage, and water levels in the canyon rise quickly as the runoff rushes down the canyon. In canyons that drain large areas, the rainfall could be many kilometers away from the canyoners, completely unbeknown to them. A calm or even dry canyon can quickly become a violent torrent due to a severe thunderstorm in the vicinity. Fatalities have occurred as a result of flash floods; in one widely publicized 1999 incident, 21 tourists on a commercial canyoning adventure trip drowned in Saxetenbach Gorge, Switzerland.[8] Authorities in Switzerland have set in the last few years high standards on safety, "Safety in adventures" label is becoming the standard for all companies to prove they are following the standard safety procedures.[9]

Temperature-related illnesses are also canyoning hazards. In arid desert canyons, heat exhaustion can occur if proper hydration levels are not maintained and adequate steps are not taken to avoid the intense rays of the sun. Hypothermia can be a serious danger in any canyon that contains water, during any time of the year. Wetsuits and drysuits can mitigate this danger to a large degree, but when people miscalculate the amount of water protection they will need, dangerous and sometimes fatal situations can occur. Hypothermia due to inadequate cold water protection is cited as a cause of a 2005 incident in which two college students drowned in a remote Utah canyon.[10]

Some canyoneering, especially in sandstone slots, involves escaping from large potholes. Also called "keeper potholes," these features, carved out by falling water at the bottom of a drop in the watercourse, are circular pits that often contain water that is too deep to stand up in and whose walls are too smooth to easily climb out of. Canyoneers use several unique and creative devices to escape potholes, including hooks used for aid climbing attached to long poles and specialized weighted bags that are attached to ropes and tossed over the lip of a pothole.

Narrow slot canyons, especially those narrower than humans, present difficult obstacles for canyoners. At times a canyoner is forced to climb up (using chimneying or off-width climbing techniques) to a height where one can comfortably maneuver laterally with pressure on both walls of the canyon. This tends to be strenuous and can require climbing high above the canyon floor, unprotected, for long periods of time. Failure to complete the required moves could result in being trapped in a canyon where rescue is extremely difficult. Past rescues have required extensive rigging systems and dishsoap to extract stuck canyoners.[11]

Narrow sandstone slot canyons tend to have abrasive walls which rip clothing and gear, and can cause painful skin abrasion as a canyoner moves or slides along them.

Immersion in water may lead to exposure to diseases such as Weil's Disease (Leptospirosis), dermatitis and gastroenteritis. Ingestion of water should be avoided and taking a shower immediately after canyoning or gorge walking is recommended.[12]

As the sport of canyoneering begins to grow, there are more and more people looking to learn the skills needed to safely descend canyons. There are several reputable organizations that are now offering classes of various forms to the public; some organizations are training organizations that offer certifications, while other commercial operations offer classes in addition to purely recreational guided tours.[15] The latter is particularly popular in tourist destinations around the world, such as Costa Rica, Hawaii, the Philippines, and Utah. Most programs have multiple levels of skill-set classes. The lowest levels usually cover the basics such as rappelling, rope work, navigation, identification of gear and clothing, and rappel setups. The higher levels cover more complex situations such as anchor building and strategies on how to descend various types of canyons. Other higher level and specialty classes typically cover rescue situations, wilderness first aid, and swift water canyons.

1.
Bali
–
Bali is an island and province of Indonesia. The province includes the island of Bali and a few smaller neighbouring islands, notably Nusa Penida, Nusa Lembongan and it is located at the westernmost end of the Lesser Sunda Islands, between Java to the west and Lombok to the east. Its capital, Denpasar, is located in the part of the island. With a population of 3,890,757 in the 2010 census, and 4,225,000 as of January 2014, the island is home to most of Indonesias Hindu minority. According to the 2010 Census,83. 5% of Balis population adhered to Balinese Hinduism, followed by 13. 4% Muslim, Christianity at 2. 5%, Bali is a popular tourist destination, which has seen a significant rise in tourists since the 1980s. Tourism-related business makes up 80% of its economy and it is renowned for its highly developed arts, including traditional and modern dance, sculpture, painting, leather, metalworking, and music. The Indonesian International Film Festival is held every year in Bali, in March 2017, Tripadvisor named the island the worlds top destination in its Travelers choice award. Bali is part of the Coral Triangle, the area with the highest biodiversity of marine species, in this area alone over 500 reef building coral species can be found. For comparison, this is about 7 times as many as in the entire Caribbean, most recently, Bali was the host of the 2011 ASEAN Summit,2013 APEC and Miss World 2013. Bali is the home of the Subak Irrigation System, a UNESCO World Heritage Site, Bali was inhabited around 2000 BC by Austronesian people who migrated originally from Southeast Asia and Oceania through Maritime Southeast Asia. Culturally and linguistically, the Balinese are closely related to the people of the Indonesian archipelago, Malaysia, stone tools dating from this time have been found near the village of Cekik in the islands west. In ancient Bali, nine Hindu sects existed, namely Pasupata, Bhairawa, Siwa Shidanta, Waisnawa, Bodha, Brahma, Resi, Sora, each sect revered a specific deity as its personal Godhead. Inscriptions from 896 and 911 dont mention a king, until 914 and they also reveal an independent Bali, with a distinct dialect, where Buddhism and Sivaism were practiced simultaneously. Mpu Sindoks great-granddaughter, Mahendradatta, married the Bali king Udayana Warmadewa around 989 and this marriage also brought more Hinduism and Javanese culture to Bali. Suradhipa reigned from 1115 to 1119, and Jayasakti from 1146 until 1150, jayapangus appears on inscriptions between 1178 and 1181, while Adikuntiketana and his son Paramesvara in 1204. Balinese culture was influenced by Indian, Chinese, and particularly Hindu culture. The name Bali dwipa has been discovered from inscriptions, including the Blanjong pillar inscription written by Sri Kesari Warmadewa in 914 AD. It was during this time that the people developed their complex irrigation system subak to grow rice in wet-field cultivation, some religious and cultural traditions still practiced today can be traced to this period

2.
Indonesia
–
Indonesia, officially the Republic of Indonesia, is a unitary sovereign state and transcontinental country located mainly in Southeast Asia with some territories in Oceania. Situated between the Indian and Pacific oceans, it is the worlds largest island country, with more than seventeen thousand islands. At 1,904,569 square kilometres, Indonesia is the worlds 14th-largest country in terms of area and worlds 7th-largest country in terms of combined sea. It has an population of over 260 million people and is the worlds fourth most populous country. The worlds most populous island, Java, contains more than half of the countrys population, Indonesias republican form of government includes an elected legislature and president. Indonesia has 34 provinces, of which five have Special Administrative status and its capital and countrys most populous city is Jakarta, which is also the most populous city in Southeast Asia and the second in Asia. The country shares land borders with Papua New Guinea, East Timor, other neighbouring countries include Singapore, Vietnam, the Philippines, Australia, Palau, and the Indian territory of the Andaman and Nicobar Islands. Despite its large population and densely populated regions, Indonesia has vast areas of wilderness that support the second highest level of biodiversity. The country has abundant natural resources like oil and natural gas, tin, copper, agriculture mainly produces rice, palm oil, tea, coffee, cacao, medicinal plants, spices and rubber. Indonesias major trading partners are Japan, United States, China, the Indonesian archipelago has been an important region for trade since at least the 7th century, when Srivijaya and then later Majapahit traded with China and India. Local rulers gradually absorbed foreign cultural, religious and political models from the early centuries CE, Indonesian history has been influenced by foreign powers drawn to its natural resources. Indonesia consists of hundreds of native ethnic and linguistic groups. The largest – and politically dominant – ethnic group are the Javanese, a shared identity has developed, defined by a national language, ethnic diversity, religious pluralism within a Muslim-majority population, and a history of colonialism and rebellion against it. Indonesias national motto, Bhinneka Tunggal Ika, articulates the diversity that shapes the country, Indonesias economy is the worlds 16th largest by nominal GDP and the 8th largest by GDP at PPP, the largest in Southeast Asia, and is considered an emerging market and newly industrialised country. Indonesia has been a member of the United Nations since 1950, Indonesia is a member of the G20 major economies and World Trade Organization. The name Indonesia derives from the Greek name of the Indós, the name dates to the 18th century, far predating the formation of independent Indonesia. In 1850, George Windsor Earl, an English ethnologist, proposed the terms Indunesians—and, his preference, in the same publication, one of his students, James Richardson Logan, used Indonesia as a synonym for Indian Archipelago. However, Dutch academics writing in East Indies publications were reluctant to use Indonesia, they preferred Malay Archipelago, the Netherlands East Indies, popularly Indië, the East, and Insulinde

3.
Canyon
–
A canyon or gorge is a deep cleft between escarpments or cliffs resulting from the erosive activity of a river over geologic timescales. A canyon may also refer to a rift between two peaks, such as those in ranges including the Rocky Mountains, the Alps. Usually a river or stream and erosion carve out such splits between mountains, examples of mountain-type canyons are Provo Canyon in Utah or Yosemite National Park in Californias Sierra Nevada. Canyons within mountains, or gorges that have an opening on one side are called box canyons. Slot canyons are very narrow canyons, often with smooth walls, steep-sided valleys in the seabed of the continental slope underwater are referred to as submarine canyons. Unlike canyons on land, submarine canyons are thought to be formed by turbidity currents, the word canyon is Spanish in origin, with the same meaning. The word canyon is used in North America while the words gorge and ravine are used in Europe and Oceania, though gorge. In the United States, place names generally use canyon in the southwest and gorge in the northeast, in Canada, a gorge is usually narrow while a ravine is more open and often wooded. The military-derived word defile is occasionally used in the United Kingdom, most canyons were formed by a process of long-time erosion from a plateau or table-land level. The cliffs form because harder rock strata that are resistant to erosion, Canyons are much more common in arid than in wet areas because physical weathering has a more localized effect in arid zones. The wind and water from the combine to erode and cut away less resistant materials such as shales. The freezing and expansion of water also serves to help form canyons, water seeps into cracks between the rocks and freezes, pushing the rocks apart and eventually causing large chunks to break off the canyon walls, in a process known as frost wedging. Canyon walls are formed of resistant sandstones or granite. Sometimes large rivers run through canyons as the result of geological uplift. These are called entrenched rivers, because they are unable to alter their course. In the United States, the Colorado River in the Southwest, Canyons often form in areas of limestone rock. As limestone is soluble to an extent, cave systems form in the rock. When these collapse, a canyon is left, as in the Mendip Hills in Somerset and Yorkshire Dales in Yorkshire, England

4.
Outdoor recreation
–
Outdoor recreation or outdoor activity refers to leisure pursuits engaged in the outdoors, often in natural or semi-natural settings out of town. Outdoor recreation may also refer to a sport game or practice held in an outdoor setting. When the recreation involves excitement, physical challenge, or risk, such as in rafting or climbing, the two primary purposes for outdoor recreation are beneficial use and pleasurable appreciation. Beneficial use is related to the physical and social rewards that goal-directed activity instills in individuals or groups, some outdoor goal-directed activities are, backpacking, canoeing, canyoning, caving, climbing, hiking, hill walking, hunting, kayaking, and rafting. Arguably broader groupings of goal-directed outdoor activities would include water sports, snow sports, goal-directed outdoor activities are predominantly physical, though they may also be mentally, emotionally, and spiritually rewarding. The outdoors as a physical or social setting may meet the needs of health, self-sufficiency, risk-taking, the building of social ties. The outdoors can be an environment in which show what they can do. Pleasurable appreciation encourages experiences of being let in on natures show and these activities may also be physically rewarding. Many people in modern civilizations believe that the value of nature is only in its utilitarian value. They would discount the inner perceptual and/or spiritual benefits of the value of nature that may be experienced during pleasurable appreciation. Outdoor activities may also be pursued for the purposes of finding peace in nature, enjoying life and they are alternatives to expensive forms of tourism. Outdoor activities are frequently used as a medium in education. Trekking is about enjoying a great walking holiday, treks can be day hikes, overnight or extended hikes. An example of a day trek is hiking during the day and returning at night to a lodge for a hot meal, trekking can be more enjoyable when undertaken while being generally physically fit. Physical preparation for trekking includes cycling, swimming, jogging and long walks and its also expected that backpackers leave no trace while enjoying the outdoors. The activity of mountain biking involves steering a mountain cycle over rocky tracks, to tackle the trails, the requirements are physical strength, stamina and a strong mountain cycle. Mountain bikes or ATBs feature a rugged frame and fork and their frames are often built of aluminum so they are lightweight and stiff, making them efficient to ride. Many styles of mountain biking are practiced, including all mountain, downhill, trials, dirt jumping, trail riding, the latter two are the most common

5.
Walking
–
Walking is one of the main gaits of locomotion among legged animals, and is typically slower than running and other gaits. Walking is defined by an inverted pendulum gait in which the vaults over the stiff limb or limbs with each step. This applies regardless of the number of limbs - even arthropods, with six, eight or more limbs, the word walk is descended from the Old English wealcan to roll. In humans and other bipeds, walking is generally distinguished from running in only one foot at a time leaves contact with the ground. In contrast, running begins when both feet are off the ground with each step and this distinction has the status of a formal requirement in competitive walking events. The most effective method to walking from running is to measure the height of a persons centre of mass using motion capture or a force plate at midstance. During walking, the centre of mass reaches a height at midstance, while during running. This distinction, however, only true for locomotion over level or approximately level ground. For walking up grades above 9%, this no longer holds for some individuals. Running humans and animals may have contact periods greater than 50% of a cycle when rounding corners. Speed is another factor that distinguishes walking from running, champion racewalkers can average more than 14 kilometres per hour over a distance of 20 kilometres. An average human child achieves independent walking ability at around 11 months old, regular, brisk exercise of any kind can improve confidence, stamina, energy, weight control and life expectancy and reduce stress. It can also reduce the risk of heart disease, strokes, diabetes, high blood pressure, bowel cancer. Life expectancy is also increased even for individuals suffering from obesity or high blood pressure, Walking also improves bone health, especially strengthening the hip bone, and lowering the harmful low-density lipoprotein cholesterol, and raising the useful high-density lipoprotein cholesterol. Studies have found that walking may also help prevent dementia and Alzheimers, the Centers for Disease Control and Preventions fact sheet on the Relationship of Walking to Mortality Among U. S. Adults with Diabetes states that those with diabetes who walked for 2 or more hours a week lowered their mortality rate from all causes by 39 per cent. Walking lengthened the life of people with diabetes regardless of age, sex, race, body mass index, length of time since diagnosis, and presence of complications or functional limitations. It has been suggested there is a relationship between the speed of walking and health, and that the best results are obtained with a speed of more than 2.5 mph

6.
Scrambling
–
Scrambling is a walk up steep terrain involving the use of ones hands. It is a term that lies somewhere between hiking, hillwalking, mountaineering, and easy rock climbing. Alpine scrambling is a term applied to scrambling in high mountains like the Alps and the Rockies of North America, the Mountaineers climbing organization defines alpine scrambling as follows, Alpine Scrambles are off-trail trips, often on snow or rock, with a non-technical summit as a destination. A non-technical summit is one that is reached without the need for certain types of climbing equipment, however, this can mean negotiating lower angle rock, traveling through talus and scree, crossing streams, fighting ones way through dense brush, and walking on snow-covered slopes. Although ropes may be sensible on harder scrambles, sustained use of rope and belay counts as climbing, typically, for this reason mountain walkers are advised to carry a rope on harder scrambles. Scramblers are also advised to know their limits and to turn back before they get into difficulties, some mountain tops may be reached by walking or scrambling up their least-steep side. The essence of a modern via ferrata is a cable which runs along the route and is periodically fixed to the rock. Using a via ferrata kit, climbers can secure themselves to the cable, the cable can also be used as aid to climbing, and additional climbing aids, such as iron rungs, pegs, carved steps and even ladders and bridges are often provided. Thus via ferratas allow otherwise dangerous routes to be undertaken without the associated with unprotected scrambling and climbing or the need for climbing equipment such as ropes. Many of theses routes include a bad step, where the scrambling suddenly becomes more serious. The bad step on Crib Goch for example, involves only 20 feet or so of climbing, the rock face here is well polished by countless boots, but there are many holds which offer firm support. By contrast, the traverse of the Cuillin Ridge on Skye demands use of a rope at one point at least, the ridge routes of Liathach and Beinn Eighe in Wester Ross are easier to traverse but are extremely exposed. Descent from such ridges is very limited, so once committed, an Teallach to the north offers scrambling, as does Stac Pollaidh further north in Sutherland, which includes a bad step. One resource for scramblers in Britain are the guides by W A Poucher, though these are now dated, a guide to 156 scrambling routes in the Canadian Rockies can be found in Scrambles in the Canadian Rockies by Alan Kane. Backpacker magazine has featured the book as an expedition guide. The Canadian Alpine Journal referred to it as a scree gospel, mount Jefferson is in Coos County, New Hampshire, and is the third highest mountain in the state. Mount Jefferson has a direct ascent along the Caps Ridge Trail, whose base and this route, gaining only 2,700 feet vertically to the summit, makes for the easiest ascent of any Presidential mountain. However, climbing over the caps involves some exposed scrambling and can be steep, many easy scrambles become serious climbs in bad weather

7.
Climbing
–
Climbing is the activity of using ones hands, feet, or any other part of the body to ascend a steep object. It is done recreationally, competitively, in trades that rely on it and it is done indoors and out, on natural and manmade structures. Climbing activities include, Bouldering, Ascending boulders or small outcrops, often with climbing shoes, canyoneering, Climbing along canyons for sport or recreation. Chalk climbing, Ascending chalk cliffs uses some of the techniques as ice climbing. Competition Climbing, A formal, competitive sport of recent origins, competition Climbing has three major disciplines, Lead, Bouldering and Speed. Ice climbing, Ascending ice or hard snow formations using special equipment, usually ice axes, techniques of protecting the climber are similar to those of rock climbing, with protective devices adapted to frozen conditions. Indoor climbing, Top roping, lead climbing, and bouldering artificial walls with bolted holds in a climbing gym, mountaineering, Ascending mountains for sport or recreation. It often involves rock and/or ice climbing, pole climbing, Climbing poles and masts without equipment. Lumberjack tree-trimming and competitive tree-trunk or pole climbing for speed using spikes, rock climbing, Ascending rock formations, often using climbing shoes and a chalk bag. Equipment such as ropes, bolts, nuts, hexes and camming devices are normally employed, rope access, Industrial climbing, usually abseiling, as an alternative to scaffolding for short works on exposed structures. Rope climbing, Climbing a short, thick rope for speed, not to be confused with roped climbing, as in rock or ice climbing. Scrambling which includes rock climbing, and is considered part of hillwalking. Sport climbing is a form of climbing that relies on permanent anchors fixed to the rock. Top roping, Ascending a rock climbing route protected by a rope anchored at the top and protected by a belayer below Traditional climbing is a form of climbing without fixed anchors and bolts. Climbers place removable protection such as camming devices, nuts, free solo climbing, Climbing without ropes or protection. Tree climbing, Recreationally ascending trees using ropes and other protective equipment, a tower climber is a professional who climbs broadcasting or telecommunication towers or masts for maintenance or repair. Rock, ice and tree climbing all usually use ropes for safety or aid, pole climbing and rope climbing were among the first exercises to be included in the origins of modern gymnastics in the late 18th century and early 19th century

8.
Jumping
–
Jumping or leaping is a form of locomotion or movement in which an organism or non-living mechanical system propels itself through the air along a ballistic trajectory. Some animals, such as the kangaroo, employ jumping as their form of locomotion, while others, such as frogs. Jumping is also a key feature of various activities and sports, including the long jump, high jump, all jumping involves the application of force against a substrate, which in turn generates a reactive force that propels the jumper away from the substrate. Any solid or liquid capable of producing a force can serve as a substrate. Examples of the latter include dolphins performing traveling jumps, and Indian skitter frogs executing standing jumps from water, jumping organisms are rarely subject to significant aerodynamic forces and, as a result, their jumps are governed by the basic physical laws of ballistic trajectories. Consequently, while a bird may jump into the air to initiate flight, no movement it performs once airborne is considered jumping, following the moment of launch, a jumper will traverse a parabolic path. The launch angle and initial launch velocity determine the distance, duration. The maximum possible horizontal travel distance occurs at a angle of 45 degrees. Muscles do physical work, adding energy to the jumpers body over the course of a jumps propulsive phase. This results in a kinetic energy at launch that is proportional to the square of the jumpers speed, the more work the muscles do, the greater the launch velocity and thus the greater the acceleration and the shorter the time interval of the jumps propulsive phase. Mechanical power and the distance over which that power is applied are the key determinants of jump distance, as a result, many jumping animals have long legs and muscles that are optimized for maximal power according to the force-velocity relationship of muscles. The maximum power output of muscles is limited, however, to circumvent this limitation, many jumping species slowly pre-stretch elastic elements, such as tendons or apodemes, to store work as strain energy. Such elastic elements can release energy at a higher rate than equivalent muscle mass. A jumper may be stationary or moving when initiating a jump. In a jump from stationary, all of the required to accelerate the body through launch is done in a single movement. In a moving jump or running jump, the jumper introduces additional vertical velocity at launch while conserving as much momentum as possible. Consequently, jumpers are able to jump greater distances when starting from a run, animals use a wide variety of anatomical adaptations for jumping. Aquatic species rarely display any particular specializations for jumping and those that are good jumpers usually are primarily adapted for speed, and execute moving jumps by simply swimming to the surface at a high velocity

9.
Abseiling
–
An abseil, also called a rappel after its French name, is a controlled descent of a vertical drop, such as a rock face, using a rope. Climbers use this technique when a cliff or slope is too steep and/or dangerous to descend without protection, many climbers use this technique to protect established anchors from damage. Rope access technicians also use this as a method to access difficult-to-reach areas from above for various applications like maintenance, construction, inspection. Rescue teams are known for using this method as a way to access injured or stranded victims. The origin of the abseil is attributed to Jean Charlet-Straton, a Chamonix guide who lived from 1840–1925, Charlet originally devised the technique of the abseil method of roping down during a failed solo attempt of Petit Dru in 1876. After many attempts, some of them solo, he managed to reach the summit of the Petit Dru in 1879 in the company of two other Chamonix guides, Prosper Payot and Frédéric Folliguet, whom he hired, during that ascent, Charlet perfected the abseil. Ropes, Climbers often simply use their climbing ropes for abseiling, for many other applications, low-stretch rope called static rope is used to reduce bouncing and to allow easier ascending of the rope. Anchors for abseiling are sometimes made with trees or boulders, using webbing and cordellete, or also with rock climbing equipment, such as nuts, hexes, some climbing areas have fixed anchors such as bolts or pitons for rappelling off of without having to leave other gear behind. A descender or rappel device is a device or friction hitch that allows rope to be payed out in a controlled fashion, under load. The speed at which the abseiler descends is controlled by applying greater or lesser force on the rope below the device or altering the angle at which the rope exits the device, descenders can be task-designed or improvised from other equipment. Mechanical descenders include braking bars, the eight, the abseil rack, the bobbin, the gold tail. Some improvised descenders include the Munter hitch, a wrap, the basic crossed-carabiner brake. There is an older, more uncomfortable, method of wrapping the rope around ones body for friction instead of using a descender, a climbing harness is often used around the waist to secure the descender. A comfortable climbing harness is important for descents that may take many hours. A prusik, Klemheist knot, or autoblock knot may be used as safety back-up, commonly referred to as an autoblock, and is used as a back-up in the case of the abseiler losing control of the abseil. One of these friction hitches is wrapped around the rope below the device, using a short loop of smaller diameter cord or webbing. The prusik loop is attached to the belay loop or leg loop of the harness. Helmets may be worn to protect the head from bumps and falling rocks, a light source may be mounted on the helmet in order to keep the hands free in unlit areas

10.
Swimming
–
Human swimming is the self-propulsion of a person through water or another liquid, usually for recreation, sport, exercise, or survival. Locomotion is achieved through coordinated movement of the limbs, the body, humans can hold their breath underwater and undertake rudimentary locomotive swimming within weeks of birth, as an evolutionary response. Swimming is consistently among top public recreational activities, and in some countries, as a formalized sport, swimming features in a range of local, national, and international competitions, including every modern summer Olympics, which takes place every four years. Swimming relies on the buoyancy of the human body. On average, the body has a density of 0.98 compared to water. However, buoyancy varies on the basis of body composition and the salinity of the water. Higher levels of fat and saltier water both lower the relative density of the body and increase its buoyancy. Since the human body is slightly less dense than water, water supports the weight of the body during swimming. As a result, swimming is “low-impact” compared to land such as running. The density and viscosity of water also create resistance for objects moving through the water, Swimming strokes use this resistance to create propulsion, but this same resistance also generates drag on the body. Hydrodynamics is important to stroke technique for swimming faster, and swimmers who want to swim faster or tire less try to reduce the drag of the motion through the water. Just before plunging into the pool, swimmers may perform such as squatting. Squatting helps in enhancing a swimmer’s start by warming up the thigh muscles, human babies demonstrate an innate swimming or diving reflex from newborn until the age of approximately 6 months. Other mammals also demonstrate this phenomenon, Swimming can be undertaken using a wide range of styles, known as strokes, and these strokes are used for different purposes, or to distinguish between classes in competitive swimming. It is not necessary to use a stroke for propulsion through the water. There are four main strokes used in competition and recreation swimming, the front crawl, also known as freestyle, the breaststroke, the backstroke, competitive swimming in Europe started around 1800, mostly using the breaststroke. In 1873, John Arthur Trudgen introduced the trudgen to Western swimming competitions, Swimming has been recorded since prehistoric times, and the earliest records of swimming date back to Stone Age paintings from around 7,000 years ago. Written references date from 2000 BC, some of the earliest references include the Epic of Gilgamesh, the Iliad, the Odyssey, the Bible, Beowulf, and other sagas

A bullfrog skeleton, showing elongate limb bones and extra joints. Red marks indicate bones substantially elongated in frogs, and joints that have become mobile. Blue indicates joints and bones that have not been modified, or are only somewhat elongated.

Wales ((listen); Welsh: Cymru [ˈkəmri] (listen)) is a country that is part of the United Kingdom and the island of …

Britain in AD 500: The areas shaded pink on the map were inhabited by the CelticBritons, here labelled Welsh. The pale blue areas in the east were controlled by Germanic tribes, whilst the pale green areas to the north were inhabited by the Gaels and Picts.